@EventHandler
    public void onPlace(BlockPlaceEvent event) {
        if (event.getBlock().getType() == Material.FENCE) {
            // Is fence
            Block fence = event.getBlock();
            Entity leash = fence.getLocation().getWorld().spawnEntity(fence.getLocation(), EntityType.LEASH);
            if (leash instanceof Leash) {
                Leash l = (Leash) leash;
                doLeash(l);
                event.getPlayer().sendMessage("Leashing you to the fence");
                doLeash(l, event.getPlayer());
            }
        }
    }